Category: Journal Articles

Abstract: In order to ensure consistency in the decision making process over time, a discrimination testing program must take into account all of five elements: The testing protocol, the sample size, the Type I error (?), the Type II error…

Abstract: In the degree of difference methodology (DOD), subjects are presented with pairs of samples, either identical or different, and must indicate how different the samples are using a t-point category rating scale. In this article, the Thurstonian model for…

Abstract: The recurring need to assess product reformulations has kept difference testing at the forefront of sensory science. Within the realm of difference testing, the Tetrad test has risen in popularity recently as its superiority over the Triangle test has…

Abstract: In the evaluation of new incarnations of existing products, difference testing is among the most commonly used sensory techniques. However, although difference testing is a classical technique, the science of difference testing continues to evolve. As Thurstonian analysis has…

Abstract: The objective of this research was twofold: first, the performance of the tetrad protocol was compared to that of the triangle test under conditions that could possibly lower its sensitivity, consequently resulting in the loss of its theoretical power…

Abstract: It is well-established that when respondents are presented with identical samples in a preference test with a no preference option, a sizable proportion of respondents will report a preference. In a recent paper (Ennis, D. M., & Ennis, J.…

Abstract: Interest in the Tetrad test has increased recently as it has become apparent that this methodology can be a more powerful alternative to the Triangle test within the standard difference testing paradigm. But when products are tested following an…

Abstract: A commonly used approach for quantifying effect sizes in sensory difference testing is the so-called “Proportion of Discriminators” or “Proportion of Distinguishers” model. Such effect sizes are quantified by determining the proportion of discriminators in the population via a…

Abstract: Additional noise from additional stimuli has been shown to result in a loss of operational power in sensory difference tests. Because the Specified Tetrad test requires the evaluation of four stimuli and has only a slight theoretical power advantage…

Abstract: Multivariate analyses are commonly used to study differences among items in a multidimensional space and to relate these findings to hedonic assessments of the same items. But there are numerous methods in use and the purpose of this article…

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